{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The results indicate that two different amorphization mechanisms occur upon milling : an amorphization at the surface of crystallites due to the mechanical shocks and a spontaneous amorphization of the crystallites as they reach a critical size , which is close to 200 A in the particular case of alpha - glucose ."}
{"Chemical": ["alpha - glucose"]}